Particle-scale and sub-grid drag models coupled CFD for simulating the CO methanation in a CFB riser |
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| Institution: | 1. Key Laboratory of Syngas Conversion of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi''an, 710119, China;2. Department of Chemical Engineering, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China;3. School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an, 710049, China;1. Ghent University, Laboratory for Chemical Technology (LCT), Technologiepark 125, B-9052 Gent, Belgium;2. Department of Chemical Engineering, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;3. Ghent University, Centre for Textile Science and Engineering, Technologiepark 70a, B-9052 Gent, Belgium;1. School of Chemical Engineering, Shandong University of Technology, Zibo 255000, PR China;2. Department of Chemical Engineering, School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, PR China;3. State Key Laboratory of Fluorinated Functional Membrane Materials, Shandong Dongyue Polymer Material Co., Ltd., Zibo 255000, PR China;1. Department of Chemical Engineering, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. National Enterprise Technology Center, Inner Mongolia Erdos Electric Power and Metallurgy Group Co., Ltd, Ordos 016064, Inner Mongolia, China;1. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzale Vincenzo Tecchio 80, 80125, Napoli, Italy;2. IFP Energies nouvelles, Rond-point de l''échangeur de Solaize BP 3, 69360, Solaize, France;3. Istituto di Scienze e Tecnologie per l’Energia e la Mobilità Sostenibili (STEMS), Consiglio Nazionale delle Ricerche (CNR), Piazzale Vincenzo Tecchio 80, 80125, Napoli, Italy;1. Division of Mechanical Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan;2. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;3. School of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The diffusion and chemical reactions inside the catalyst particles and the heterogeneous flow structure in the computational cells are key factors to affect the accuracy of the coarse-grid simulation in circulating fluidized bed (CFB) methanation reactors. In this work, a particle-scale model is developed to calculate the effective reaction rate considering the transient diffusion and chemical reactions in the particle scale, i.e., the scale of the single catalyst particle. A modified sub-grid drag model is proposed to consider the effects of the meso-scale and chemical reactions on the heterogeneous gas-solid interaction, where the meso-scale is between the single particle and the whole reactor and featured with the particle cluster. Subsequently, a coupled model is developed by integrating the particle-scale and modified sub-grid drag models into CFD. Moreover, the coupled model is validated to achieve accurate predictions on the CO methanation process in a CFB riser. Notably, the coupled model can be performed with a coarse grid (～58 times particle diameter) and a large time step (0.005 s) to accelerate the simulation. By simply changing the reaction kinetics, different gas-solid catalytic reaction systems can be simulated by using the coupled model. |
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| Keywords: | Computational fluid dynamics Circulating fluidized bed CO methanation Particle-scale model Drag model |
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